lawrence Cyoa Part Deux

alrighty! tried to respond to most of the comments previously. Feedback appreciated!
With a single statement anyway, maybe better to just unwrap the `.tap` and `.select!` ?

```
def arriving_flights(builder, time)
  scheduled_flights(builder.schedule_arriving_url).select do |flight|
    flight["arrivalTimeUtc"].to_datetime < time
  end
end